tree: https://gitlab.freedesktop.org/agd5f/linux.git amd-staging-drm-next head: b78bd8003071f2bcd1a9d2404f274ff0b52a4a6a commit: c9130176a41e56044df495a72f7eb2027824034a [2314/2370] drm/amd/display: Workaround for stuck I2C arbitrage config: arc-randconfig-002-20250718 (https://download.01.org/0day-ci/archive/20250718/202507180659.A4dgugSk-lkp@xxxxxxxxx/config) compiler: arc-linux-gcc (GCC) 15.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250718/202507180659.A4dgugSk-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202507180659.A4dgugSk-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_i2c_hw.c:380: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * If we boot without an HDMI display, the I2C engine does not get initialized vim +380 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_i2c_hw.c 378 379 /** > 380 * If we boot without an HDMI display, the I2C engine does not get initialized 381 * correctly. One of its symptoms is that SW_USE_I2C does not get cleared after 382 * acquire, so that after setting SW_DONE_USING_I2C on release, the engine gets 383 * immediately reacquired by SW, preventing DMUB from using it. 384 */ 385 static void cntl_stuck_hw_workaround(struct dce_i2c_hw *dce_i2c_hw) 386 { 387 uint32_t arbitrate = 0; 388 389 REG_GET(DC_I2C_ARBITRATION, DC_I2C_REG_RW_CNTL_STATUS, &arbitrate); 390 if (arbitrate != DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_SW) 391 return; 392 393 // Still acquired after release, release again as a workaround 394 REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_DONE_USING_I2C_REG, true); 395 REG_GET(DC_I2C_ARBITRATION, DC_I2C_REG_RW_CNTL_STATUS, &arbitrate); 396 ASSERT(arbitrate != DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_SW); 397 } 398 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
